I'm a photographer. The first company that I ever used was Picaboo. The quality was above acceptable, but productions not meeting deadlines left something to be desired. After a few books, I found very quickly that I preferred the seamless lay flat option on all my books. The clean more professional feel to the thicker paper on the 12x12 book by far exceed any other options. So after a few lay flat books and some problems with orders again not meeting production deadlines and shipping, I tried Adoramapix. I've know of the for prints but not books. I received my first book which was a duplicate to a book already printed at Picaboo. The first was a gift. I was extremely happy with the quality. The book construction was just better. The surface of the cover had a more polished professional feel. The print quality looked the same as did the thickness of paper, but the photo paper's finish set them apart from one another. More importantly, I have not had to call to find out why an order is days past production time, creating shipping deadline issues.
I can't say enough about my experience with Adoramapix.
Beyond book construction and deadline differences, price wise the cost of the lay flat book is $40 less at Adoramapix. I've never paid full price for a Picaboo book but having to hunt down a half price coupon vs the regular price is more worth my while. Plus I can also use one of there coupons to make things even cheaper.
This company provides what I believe is the best books from all the options available. I have colleagues that use the others but I haven't been impressed as much as with Adorama.